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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccba06e75cc49eee6f5a0f3b3434aa7f9a5da370cccc01fca64dff369f4dfef' 
  AND token = 'R8K5A/HCvd6kx9vvdLuTGWf3K8upApuqkoedRMDS17k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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