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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969284ae792355b792bb117f6d5950b8a3900b2f9f4b96ccb81c67d3c6fb30b3' 
  AND token = '2cEWSuI9Kl4Cp7UNjWzDjQ0dZ/tk1pLOqkYWjEJEGWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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