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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e3fac5a16772d6b6059f5401b614fd9987590b79180c382f5fca8fdb4297bd' 
  AND token = 'ZOQ/SAUGgxGeAzITclfv7GpsZAAM52HRukj1IWQeqNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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