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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036c47656f7880c79c49861be94df29fd499cb98bb54b9334bf036145c2a81cb' 
  AND token = 'bkzPB84//prMKqCo95AlWNby1VcC2u+H8QGzOkqLDIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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