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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4dfa7906ec41b20fc864689ff28e8ef1d08db8d9b04fbb50ec56d96cb357cf' 
  AND token = 'wfDY5QtBRJ0ZoT7f4u58rrmxoRP/SGpq80cbjiu+d3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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