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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4627f2f42eee1e83a6fff9f6a3794bede3d59894a52190c17b855cb03095ec' 
  AND token = 'bMirGBE1QqE0L2J47e3AL1IcIdkWxX9SgYPpWlkqHQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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