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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc788d25c56b85e878ef9e4da48a8d79fc552813a46a1308721c5b8807b8c4c' 
  AND token = 'N4yvN5NiMwVZwL7if9d6GnWBeKbPaYLmg7UgHKk+nbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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