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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ececb6ac1a853011f7ee3aaa03973ebb96dfa8505b386690ca231c158bea33ef' 
  AND token = 'MC0PMj86oPS5oNjeW4hkz9geTsqbV2QFfquljJozVYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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