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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7526822a68009f76e7d786f567ac983d1d7c5ae8ecc0fb216c9a38c965f0b2' 
  AND token = 'M44YH/bB/C5PhakxXQ89EaqEgVgrlntywHVY9zmXB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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