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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0738cb5c90abb405eab032efab19e48ffb9388260d27c5b62fc71ffc46f4f5e2' 
  AND token = 'TuteKcorQVPXAwdo8z/Ndwl25uBPXd1kyZIl4+JaoyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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