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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24c1fa5c88d72925ebc020fbbee849811aa0b45bd23036a4e0e0779a3a43427' 
  AND token = 'a1HJgwu8Zh5PDMO48VZ8zkfsjQjnFsMKchVvatCOQaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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