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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b57baffeba80248a96b99420dda912c5ae625e76da9f6afb11f5d407ed5a5d' 
  AND token = 'zPsl4OlggMzB/HD4z3KCu5AfehGY7z6Y5yh0bAn/bYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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