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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d88c843f17c23ca758e353361c9cd503f920e304cf64d019d7ae90948cb219e' 
  AND token = 'Dp4BjTSv6W//MY9Q37Acl6TtUmWBNLItYDEta9/JcqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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