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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496c52ddc63e5ab2cc0ea49a4ab23445c4e799f1dde934611ac6440ff1bab36f' 
  AND token = 'v5zBdObeMv5iq5hYvyq6b82tk9zxL40yWWdD2mIULI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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