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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4834a43de1c48df9c6dfcf90fc331e36529dc08c7a57225d5a1d9ecfa571b670' 
  AND token = 'srP6Cfsc0oVwD+yiSwqJaN6F2vK/w5S2MmazbNLHlcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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