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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3b792a503a6d0ae099af5ee1c248ae2b35f587773c86b608834cc0ee76616c' 
  AND token = 'G6EJANn/49KWufTH8hXDyF6Vj49TdtDgTMCi7G5HiWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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