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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b719bcb369382cea6bdd24faa51bc588b1da793ce22f31fab7dc2a96923b0da' 
  AND token = 'N8l+NvdeA2ayJuUMrTBd6KSdvrGqrv07lROmjtQYYhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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