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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb972865dc8c1f513fc59a99a8c72a8b6b732fd3d094a9712af5569076b7dae3' 
  AND token = '4N8QtIu7fo2rbhzQOV+W+lUTMXOtubd7ZATmRIH0qv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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