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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602c01e18997ffc22373f57fe1a4c2e5713ae5422bbbd2ec8980d671e7d4a6c6' 
  AND token = 'cxdzMVNbYLZe59Ng7r+7b796w5v9qZXRLpl+QpsmcgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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