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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294e9d17ac73ba6baa0ade011b132d6a9c9fc89bb3b0920e9b108c1638a28554' 
  AND token = 'n64I4kL+rUqttdrDlKELg1kfCrMb9x5h5LAw/yDvTVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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