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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4692dcee7d5647c964a39ca0d9f78d44bfc8d37d502d712521e55582d4ee90b2' 
  AND token = 'XaOigNnLTWyDOgquQy5Zq+dM9ia7j169tDuEV1r7XRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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