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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28353e9de6625bed2a2ddc33526921dc9ffd5e90ad2d77c03c2dceb56c61f2fe' 
  AND token = 'epmVF/m+CiV0tURCFb8+wKgr9kYU7Ef4E1TJKBeTQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}