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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f582317adb2bdd18597d40626b959dccbbe97ed07316f5e7f1b448cfd1e2c21e' 
  AND token = 'mFsfY4qFJtCxmo5330pURHOmIqxk9a3Fy+4lWUoo6uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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