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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5ae568122af8e4c7e7ba9d424ecd23a716ebf6d06b2b8162b57718ffc52b2d' 
  AND token = 'BiitE9LwFTM7dPFxCN5y08htuOjr3HJ0HBtjCgfViEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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