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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76767bb1a5a3adf49525525fddf0a1ec1adc33af6422bf33b5c56e04f37fe3b1' 
  AND token = 'xwm4MG/53dfaGirD1pJlJFozewlzsxloWXqx61vquys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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