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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dcddf240adc30cde59e6e8b55d7b19ea31ec3b52137f8c243e55bf061cd14f' 
  AND token = 'G0w1pHoK/BhZZlc+wHrdBngSPBjVlx801cGB5RKan0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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