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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174059fcee4e03baba763f09e7f8dcbba3796ef1c8699b2714c839c29ceaa5b2' 
  AND token = 'UstOzi924hgjsToF2hRUQWLWiL3zwDLNpWNWYDIfNGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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