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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57591045a633afa13bd94d84de500e20e08b74615471b07241cdaaf91b4a1584' 
  AND token = '11Ksfuo9KG50weQrScethHkjBeVjCKr2+0/8tJC/mCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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