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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb6328e5bed128f2e03b8562ff8349dde24c446f45a58d94857ff980c5fd663' 
  AND token = 'k0qIjVyu1AETZXvk1kiVlhssauNFtRWXhEMdhHi05Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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