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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9326714d5e4ac0fc6c52a8983d257e5e719c69b24876d4a518250452cee0340' 
  AND token = '2ocJYMQWaSPcuYSbNvoZz70j6du0Lp55DcYGOuWausM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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