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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98386e0df103e87f35bab4e310cb0c667cc33106dd7fa982b7dbd79c32ac4bab' 
  AND token = 'tsc/ZG0nOtyUTM0VaKHA7vkydRJ+MiD9m6bOGNH2Eco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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