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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ed8a452b846c5881f9f629bed82b99606e21c96812aebca7c69daf21d414c5' 
  AND token = 'T9EqftdGllaOAwhZ4LKZvL4LNbHby1TP5iRj/A/unA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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