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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cd23304e2596f9fd3ed8d1e8ba33614168eb2932cff04323811193f5963a3b' 
  AND token = '+9d9dLNp47Kp6yu/9fPp3g/MsNwmZvHWpI83jL4tH1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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