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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34f64cd5b1301b131166d18df44fc92f6e387ac02f74fef0f37cbfc2aa9798b' 
  AND token = 'tJHEhk6tXGCrwuGW3GTRuEoJ8umjVZ0g3w0ygnF2ft8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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