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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0645a58d60dccb65a1ce66e4adf5d7c12c488118de8b699077a209c44d9381bc' 
  AND token = 'Nyg8byxtV7qVkY0SFsYA1vu6EegetAlgBvAXhsSX8Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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