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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a4371c17f7220cb33703d1456433c558328387fd423f54c1a5be522d373205' 
  AND token = '4FzGOFbgjO4bwONysfjI6DdSo1+QVCk3/F5zuZUq8ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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