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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906e67fb826c8f6ed99855f1be2a0f809ad49ac65dd22bf21dcb6f837e3d768c' 
  AND token = 'Bkjdk1ubEUFhd81R1aufY3galR8MGe6Nn6zeL3W7dLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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