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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11734b18006343925a44f0c66560f9cf30753e6472ccf1f0ddd8fd774f60c222' 
  AND token = 'lj5kU4xus19Nnmsea7vQCO4eYs9BQ3wJdnizFGFlqdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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