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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137a6e3dd1c781d375790ff4149a3f68a72dc707c28202b6102a8c347c2338db' 
  AND token = 'yKrYHx5vpKutamS/bKsdpNbMwq7OnHRuWpL5zCgDRQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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