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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10b8094532d7e259146ad145c6d29c91442c60f092c05621eb72b913a9805ed' 
  AND token = 'IUR+VTUbSfStQVkl8hVNr7RD01WVUp9ldPXJsGkqBOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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