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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae63082914456c8370510404cfd1f1959644e8f7d1ac313e9d5ebce6ea34813a' 
  AND token = '8OLAVdqx+8Yb5W08sgX+ATKNhglQSpOzhju+2mY1bns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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