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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669b8cfac10c3368fe6841ea703a6681686b391f3fc39d12fc60a0dce5443931' 
  AND token = '+9zp8avDn3ehGQsz5Cn8CVfNLx/0zkcHTTNPtuft/LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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