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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b7c16ea7117d3e0c2a2b8314cb22c546b06004604baa5624ed3e2d8aaef6d' 
  AND token = 'WevLl5dRjmZmHpm0Nq39rNM0qI5I5XjbS86TgXuiWjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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