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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd925fbcc0f114b88c6238ba6940cac7b91427fd58b99c65acdef9cb3d868159c' 
  AND token = 'cIr2W0irnQ5xkFMFSOHKboSPV+a/kiB/2v5RSWM8vwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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