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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e61f45b1ee170065ef366cb9e03b1818a6acc1191e0697304a54bebca797733' 
  AND token = 'Qx9ZJq8S0/0Sl/KCkNinkoyMMSQtzIXPIFUiQZjWQLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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