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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737956799dc728c418ecf25422fa5053c557b17f73a8178035ce406a35376032' 
  AND token = 'nLtGVHKsUHqOzntyW4Oz0thIF2BUvfRg+dTucoOyuMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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