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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c585c55ee806c394df41f1a5ba826b20474acf4876516c194cb84b23b51e4d6' 
  AND token = '8UwsJsQMdORA1O3NfyzDpXn/i/vD0gNDyxBlSmWBX7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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