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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99230fc76ada2fcbef6898d86ba58f96c41d3e3d36ec4f4a0f86201caa65fee8' 
  AND token = '3IZOdGqTGBgoMGwqbB6Ti/I4/5Df+cr3PpgRpKGTGVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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