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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e138aa8a3abaf0aec4798444c495906696f159fde6b4eee4a21fa36a1af5ec4' 
  AND token = 'ZftXEP7pVQh7LPnsj2IP4kba5wUe3Iqi3trRFUQaOZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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