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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6562b3a459aa0c2a3bcb77d04e54b7f92204ff7ee6db5ae18f01310a6fef5f8' 
  AND token = 'sWh9De53srtC0to6JN9yNSTgG0AYIdPJBK+OAdMu8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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