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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e864fb8f1fee2bf39d70e7841e68b7b38afa954df148a1496ef082addefbe8' 
  AND token = 'RajR9t/peRurEfB5duqitAYMHElqfMAib/U6kPaJyi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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