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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a407022f15aaced8d1a19c0eb651f35d79850a5a40df04c1289a7449b28ed90f' 
  AND token = 'd/KzQEkVo7ilrSzi+bw0yTNo3Ufhf614Blg5SEHpMvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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