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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e118a345d0fd0b17da3a7772c88faba342c1897c3486e26c0ef40efc810c176a' 
  AND token = 'ZE30UWq8WjDoBc/DK8ReKH1KzA97J4aZ00rXM3q2v2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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