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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d4cf8a0082c0574e0424302ab958ca8d12c068dcbced951f0b99da47bc4a51' 
  AND token = 'j6PdW6ej/nxyZnft2ZeyWIGBqQhioMN4WLOzbeCStJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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