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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3603e7cc8c374b2b59959a6012c4aa8632ce42375877b8ae83e4dcc16f0b92' 
  AND token = 'KoyxM0fcq9G/o8ZVAdv+ME4sObSQAxSElyWb9bdE+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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