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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f87afd34ea80f37b940e2412731503b5f6457212cced32f7f75eeb3a5c91a11' 
  AND token = '5Z/7QBrttNd/QnCV+GRNqYmf7/Vx4Ka0qrFws2OU17g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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