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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7b41cc3c9967d1d82d2be22652dc8ec2dca3f3661f91e714aa6832b5c64919' 
  AND token = 'Q0RTBsX784mbvfg12YqgBte6IYniB+vuc4IVvP5YutA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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