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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e13d68e24412e7b1854427e90d9e6cd847a0f2f4778ed71a703806c9dd55307' 
  AND token = '/Bjkz38i7fSHk026SrV+RYkqq0p9v6yeSNvMzNPaecM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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