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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ce7917b2e932bfcc7fb8fe108fc069798a9a871e4e867b6b01ef6fcba553c1' 
  AND token = '+hLFcc5TgXHHGH/qITp+Gwm/8Pzh8MVF8fiIyuA/vno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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