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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39101ce1e93f4ea4c65cb5d318d1f91dd8462ccd61c8ff6931bcdf6b7f1c9498' 
  AND token = 'Ob6NSTaUSk5KEBk3Jklg0Zoh1gXxnGATYWdRntXI+oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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