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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1f3f9d981feb4c453bc67efbbcda1b373a3e1855eb0809d1d5dab1d7a9f86c' 
  AND token = '2Ef/yvupYI8/ykyHGWD3NBdKy8k4aOiurJK/N95MfKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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