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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53eebcd1d4d368498e4aeed1ce094cef6855cd0f6a43cdc2ad220998bc4cb90f' 
  AND token = 't4tAPzPND1drkhvj7Ft1mqL+bn3MY+HXIW/jeVX5iWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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