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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4af9c0914963cd45c998c6445468aca80cceb15e2d103072f680c544f1076e' 
  AND token = 'v8A4YRnqLPHiwV/C0o89UibQy/sU0y1yL90OjVPNSEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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