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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e67cc3af9c50af26346b6313baa4bbd1f1f8e65d331fed3d9d20f2230890db5' 
  AND token = 'QJ9AtOifLkcbMi5Bbz9bPIRLveOyLJXU8XXEZdOBanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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